食品质量在很大程度上取决于食品的包装过程。为了抑制食品变质并延长货架期，食品包装技术在食品工业的应用得到了越来越广泛的发展。利用散射介质中的气体吸收光谱技术对食品包装中的气体含量进行光学无损检测。用中心波长为760 nm 的二极管激光器测量食品包装中氧气的吸收光谱信号，通过研究包装内的气体交换过程估算出包装内的氧气体积分数。实验结果表明该技术可以用来测量食品包装中的氧气含量，确保食品包装的紧密型和安全性。

Food quality is greatly dependent on the security of the food packaging process，which has been widely developed to inhibit food spoilage and to prolong the shelf life for food products. Gas in scattering media absorption spectroscopy is used as an optical noninvasive method to estimate the gas content in food packages. A diode laser with central wavelength of 760 nm is used to record an oxygen spectroscopic signal, and then to estimate the oxygen content by investigating the gas exchange in the package. The experimental results show that the technique can be used to determine the oxygen concentration and to assure the integrity and security of food packages.